A virus particle (virion) consists of genetic material enclosed in a protein coat called: MCQ with Answer and Explanation

A virus particle (virion) consists of genetic material enclosed in a protein coat called:
A. Envelope
B. Cell wall
C. Plasmid
D. Capsid
Answer: Option D
Solution (By JKSSB Mock Tests)
A virus is an obligate intracellular parasite. The basic structure of a virus particle, or virion, consists of genetic material (either DNA or RNA, but never both) enclosed in a protective protein coat called a capsid, made of subunits called capsomeres. Some viruses also have an outer lipid envelope derived from the host cell membrane.

Discuss this Question (0)

No comments yet. Be the first to start the discussion!

Practice More Biology Questions

Question #1
In genetics, the phenomenon where a heterozygous individual exhibits a phenotype that is intermediate between the two homozygous phenotypes is called:
A. Codominance
B. Multiple allelism
C. Epistasis
D. Incomplete dominance

Correct Answer: Option D


Explanation:
Incomplete dominance is a form of inheritance where the phenotype of the heterozygote is a distinct intermediate blend of the phenotypes of the two homozygotes. Neither allele is completely dominant over the other. A classic example is the flower color in snapdragons (Antirrhinum), where a cross between a homozygous red (RR) and a homozygous white (rr) plant produces heterozygous pink (Rr) offspring. Codominance, in contrast, involves the full expression of both alleles simultaneously (e.g., AB blood type).

This question belongs to: Science Biology
Question #2
The pigment that gives the brown color to algae such as kelp is:
A. Phycoerythrin
B. Phycocyanin
C. Fucoxanthin
D. Chlorophyll

Correct Answer: Option C


Explanation:
Fucoxanthin is a carotenoid pigment found in brown algae (Phaeophyceae) that gives them their characteristic brown or olive-green color, masking the green chlorophyll. Phycoerythrin is red (red algae), phycocyanin blue (cyanobacteria, some red algae). Brown algae include kelps and Fucus.

This question belongs to: Science Biology
Question #3
In molecular biology, the 'Wobble hypothesis' explains the flexibility in base pairing between the:
A. First base of the codon and the first base of the anticodon
B. Second base of the codon and the second base of the anticodon
C. Third base of the codon and the first base of the anticodon
D. DNA template and the newly synthesized mRNA

Correct Answer: Option C


Explanation:
The Wobble hypothesis, proposed by Francis Crick, explains the degeneracy of the genetic code. It states that the base pairing rules (A-U, G-C) are strictly followed for the first two bases of the mRNA codon, but the third base of the codon (the 3' end) can form non-standard or 'wobble' base pairs with the first base of the tRNA anticodon (the 5' end). This allows a single tRNA molecule to recognize and bind to more than one synonymous codon.

This question belongs to: Science Biology